While reading up on propane, I found out about absorption refrigerators, which use heat in the refrigeration cycle rather than a compressor. Apparently the technology was invented in the '20s (and that PR whore Einstein was co-named on a later patent), and is in use in some applications.
I dislike compressors because they're noisy, so silent operation is very attractive. Dometic makes refrigerators for RVs that use the absorption method. As a plus, they are typically "dual fuel", electric and LPG. Unfortunately, they're quite expensive relative to their size: $600 for the smallest non-portable model (BigDiscountRV).
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